Each ach nephridium of earthworm opens to the exterior by__________?
Correct answer: B. Nephridiopore
- A. Nephrostome
- B. Nephridiopore
- C. Flame cell
- D. Anus
Explanation
A nephridiopore is the external opening through which an earthworm's nephridium discharges excretory fluid. The likely mistake is nephrostome, which is the internal ciliated funnel that collects coelomic fluid rather than the external opening.
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About Excretion
Excretion removes metabolic wastes such as carbon dioxide, urea and excess salts, and differs from egestion, which removes undigested food. Questions cover kidney structure, nephron ultrafiltration, selective reabsorption and urine formation, along with the excretory roles of the lungs, skin and liver in maintaining homeostasis.
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